The BGS Lexicon of Named Rock Units — Result Details

Fulmar Formation

Computer Code: FLMR Preferred Map Code: notEntered
Status Code: Full, pending ratification
Age range: Callovian Age (JC) — Tithonian Age (JI)
Lithological Description: The formation consists predominantly of olive-grey to pale grey, fine- to medium-grained, occasionally pebbly, generally arkosic, glauconitic sandstone. It is often argillaceous or carbonate cemented. In some areas it is massive with few sedimentary structures, but in others it becomes argillaceous and strongly bioturbated with a number of different burrow types. 'Raxella' spicules and bioclastic debris are locally common.
Definition of Lower Boundary: The formation rests on a variety of Triassic and Devonian deposits. The lower boundary in the Fulmar Field is a change from grey sandstone to Triassic red-beds comprising mudstone or silty sandstone and gamma and velocity values increase. In the Fischer Bank Basin the boundary is placed at a downward change from marine sandstone (Fulmar Formation) to paralic, coal bearing sediments (Pentland Formation). In the Kittiwake Field the sandstone of the Fulmar Formation rests on Triassic sandstone; the boundary is difficult to recognise from log responses and colour change. In the Glamis Field, the formation rests on Devonian strata.
Definition of Upper Boundary: The upper boundary is defined by a downward transition from mudstone (Heather or Kimmeridge Clay formations) to sandstone. It is characterised by a down-section decrease in gamma values and an increase in velocity.
Thickness: Usually 60-110 m, but up to 366 m in the Fulmar Field. It thins southward onto the Mid North Sea High.
Geographical Limits: UK Central Graben; North Sea Quadrants 16, 21-2328-3037 and 38.
Parent Unit: Humber Group (HMBG)
Previous Name(s): 'Fulmar Sands' (-5101)
'Puffin Formation' (-5102)
Angus Sands (-5103)
Frigate Formation (-5104)
Hugin Formation (HUGI)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  North Sea well 30/16-6 at 3147.5-3423 m depth below KB. Richards et al. (1993). 
Reference Section  North Sea well 22/5b-2 at 3386-3660 m depth. Richards et al. (1993). 
Reference Section  North Sea well 21/18-3 at 3084-3148 m depth. Richards et al. (1993). 
Reference Section  North Sea well 21/30-3 at 2580.5-2663 m depth. Richards et al. (1993). 
Reference(s):
Johnson, H D, Mackay, T A and Stewart, D J. 1986. The Fulmar Oilfield (Central North Sea): geological aspects of its discovery, appraisal and development. Marine & Petroleum Geology, 3, 99-125. 
Price, J, Dyer, R, Goodall, I, Mackie, T, Watson, P and Williams, G. 1993. Effective stratigraphical subdividion of the Humber Group and the Late Jurassic evolution of the U.K. Central Graben. In: Parker, J.R. (ed.) Petroleum geology of Northwest Europe: Proceedings of the 4th Conference, 443-458. [Geological Society, London] 
Richards, P C, Lott, G K, Johnson, H, Knox, R W O'B. and Riding, J B. 1993. 3. Jurassic of the Central and Northern North Sea. In: Knox, R W O'B and Cordey, W G. Lithostratigraphic nomenclature of the UK North Sea. [British Geological Survey, Nottingham] 
Donovan, A.D., Djakic, A.W., Ioannides, N.S., Garfield, T.R. & Jones, C.R. 1993. Sequence stratigraphic control on Middle and Upper Jurassic reservoir distribution within the UK Central North Sea. In: Parker, J.R. (ed.) Petroleum geology of Northwest Europe: Proceedings of the 4th Conference, 251-269. [Geological Society, London]. 
Clark, D N, Riley, L A and Ainsworth, N R. 1993. Stratigraphical, structural and depositional history of the Jurassic in the Fisher Bank Basin, UK North Sea. In: Parker, J.R. (ed.) Petroleum geology of Northwest Europe: Proceedings of the 4th conference, 415-424. [Geological Society, London] 
Hall, S.A. 1992. The Angus Field, a subtle trap. In: Hardman, R.F.P. (ed.) Exploration Britain: Geological insights for the next decade. Special Publication of the Geological Society, No. 67, 151-185. 
Fraser, A.R. & Tonkin, P.C. 1991 The Glamis Field, Block 16/21a, UK North Sea. In: Abbotts, I.L. (ed.) United Kingdom oil and gas fields, 25 years commemorative volume. Memoir of the Geological Society, London, 14, 317-322. 
Robson, D. 1992. The Argyll, Duncan and Innes fields, Blocks 30/24 and 30/25a, UK North Sea. In: Abbotts, I L (ed.) United Kingdom oil and gas fields, 25 years commemorative volume. Memoir of the Geological Society, London, 14, 219-225. 
Stewart, D J. 1986. Diagenesis of the shallow marine Fulmar Formation in the Central North Sea. Clay Minerals, 21, 537-564. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable